Treatment of cotton and artificial silk



Patented Sept. 22, 1931 UNITED STATES PATENT QFFICE PAUL KABRER, OFZURICH, AND WALTER WEHRLI, OF BINNINGEN, NEAR BASEL, SWITZERLAND,ASSIGNORS TO THE FIRM OF CHEMICAL WORKS FORMERLY SA NDOZ,

OF BASEL, SWITZERLAND TREATMENT OF COTTON AND ARTIFICIAL SILK NoDrawing. Application filed January 20, 1928, Serial No.248,269, and inGermany January 28, 1927.

It has been found, that if cotton or artificial silk fibres (viscose,cuproammonium and nitrocellulose silk) are simultaneously treated atelevated temperatures with a halide (chloride or bromide) of any of thealiphatic oraromatic sulphonic acids (for instance toluene-, benzene-,benzylor ethylsulphonic acid chloride) and a tertiary, alihatic,aromatic or heterocyclic organic ase, like triethylamine,dimethylaniline, pyridine, its homologues, quinoline and likesubstances, improved fibres can be obtained, which contrary to theoriginal ones, show a good affinity for acid dyestuffs and yield fastshades. The process can also be carried out by treating the abovementioned fibres with the products of reaction of the above mentionedacid halides with tertiary organic bases. The reaction may be carriedout at lower or higher temperatures (for instance at 70 C. up to 1100.). The new effect is very surprising. According to the process of theUnited States Letters Patent No. 1,523,742, fibres may be obtained bythe interaction of alkalized cotton and aromatic sulphonic acidchlorides, which are refractory against direct cotton dyes and-which.

are only dyedby certain acid colors, As against this the improvedprocess allows to produce fibres which can be dyed by acid colors quitegenerally.

The following examples illustrate the improved process, the parts beingby weight.

Example 1.3.7 parts of cotton are treated in a convenient closed vesselwith 7.4 parts of benzene-sulphonic chloride and 40 parts of pyridine.The temperature is kept during one hour and a half at 110 C. The yarn isthen washed with water and can be dyed after this treatment with acidcolors in fast and level shades.

The duration of the interaction may also be diminished for instance toone hour and the pyridine may be replaced by a mixture of pyridinehomologues, quinoline or triethylamine.

Example 2. 3.9 parts of mercerized cotton are heated at 110 C. for threehours with a mixture of 7.8 parts of p-toluene-sulphonic chloride, 10parts of pyridine and 20 parts of nitrobenzene. The yarn then washed anddried shows the mercerization lustre unaltered and can easily be dyedwith acid colors. In this example, the nitrobenzene can be replaced byanother indifferent organic solvent having the desired dissolvingproperties, such as carbon tetrachloride for example.

Ewample 3.5.7 parts of viscose silk (or ammoniumcuproxide silk ornitrocellulose silk) are immersed into a mixture of 11 parts ofp-toluene-sulphonic chloride and 35 parts of pyridine. The yarn is thenkept a quarter of an hour at ordinary temperature and the mixture isthen heated at 110 C. for half an hour. The washed and dried viscosesilk thus treated returns its lustre fully, but contrary to theuntreated fibre,

it can be dyed with acid colors of any kind,

such as for example lanafuchsine 6B (color index No. 54), acid violetGBS (color index No. 717), patent blue A (color index No. 714) andnaphthalene green V (color index No. 735), in level and fast shades. Inthis example, the reaction may also be carried out in presence of anindifferent organic solvent, such as nitrobenzene or carbontetrachloride. Furthermore the fibres as well as the reacting compoundsare advantageously water-free.

at we claim is:

1. A process for rendering cotton and regenerated cellulose fibrescapable of being dyed byacid colors, consisting in treating these fibressimultaneously with an aromatic sulphonic chloride and a tertiary.organic base.

2. A process for rendering cotton and regenerated cellulose fibrescapable of being dyed by acid colors, consisting in treating thesefibres simultaneously with an aromatic sulphonic chloride and a tertiaryorganic base in presence of an inert organic solvent. 7

3. A process for rendering cotton and re-- generated cellulose fibrescapable of being dyed by acid colors, consisting in treating thesefibres simultaneously with an aromatic sulphonic chloride of the benzeneseries and a tertiary organic base in presence of an inert organicsolvent.

4. A process for rendering cotton and regenerated cellulose fibrescapable of being dyed by acid colors, consisting in treating thesefibres simultaneously with an aromatic sulphonic chloride of thebenzene, series and a heterocyclic tertiary organic base in presence ofan inert organic solvent.

5. A process for rendering cotton and regenerated cellulose fibrescapable of being dyed b acid colors, consisting in treating these fi ressimultaneously with an aromatic sulphonic chloride of the benzene seriesand.

15. pyridine in presence of an inert organic solvent.

6. A process for rendering cotton and renerated cellulose fibres capableof being yed by acid colors, consistlng in treating these fibressimultaneously with p-toluenesulphonic chloride and pyridine in presenceof an inert organic solvent.

7 A process for rendering viscose silk capable of being dyed by acidcolors, consisting in treating these fibres simultaneously withp-toluenesulphonic chloride and pyridine in presence of an inert organicsolvent.

In witness whereof we have hereunto signed our names this 5th day ofJanuary,

PAUL KARRER. WALTER WEHRLI.

